code: def client_variable_reader(app, user_variable_reader):
      """Client for User that can only access the first DAG from TEST_FILTER_DAG_IDS"""
      return client_with_login(
          app,
          username="user_variable_reader",
          password="user_variable_reader",
      )
  
imports: from __future__ import annotations
  from io import BytesIO
  from unittest import mock
  import pytest
  from airflow.models import Variable
  from airflow.security import permissions
  from airflow.utils.session import create_session
  from tests.test_utils.api_connexion_utils import create_user
  from tests.test_utils.www import _check_last_log, check_content_in_response, check_content_not_in_response, client_with_login
label_desc: Use image node_id 3 for calling a global function with example usage: client_variable_reader(app, user_variable_reader) and returns: client_with_login